doc: zigbee: add deprecation note to all Zigbee-related pages

[wiba-nordic]

Zigbee R22 support is deprecated with nRF Connect SDK v2.8.0. This adds a note to the start of every Zigbee-related page to inform the user of this.

[NordicBuilder]

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Build number: 5

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Enabled	Name	Description
	ci-disabled	Disable the ci execution
	ci-all-test	Run all of ci, no test spec filtering will be done
	ci-force-downstream	Force execution of downstream even if twister fails
	ci-run-twister	Force run twister
	ci-run-zephyr-twister	Force run zephyr twister

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[NordicBuilder]

You can find the documentation preview for this PR at this link. It will be updated about 10 minutes after the documentation build succeeds.

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[wiba-nordic]

Addition of select DEPRECATED to the Kconfig was discussed and agreed on offline.

[b-gent]

Looking good!